public override TimeTagIndexCaretPosition MoveLeft(TimeTagIndexCaretPosition currentPosition)
{
// get previous caret and make a check is need to change line.
var lyric = currentPosition.Lyric;
var previousIndex = GetPreviousIndex(currentPosition.Index);
if (TextIndexUtils.OutOfRange(previousIndex, lyric?.Text))
{
return(MoveUp(new TimeTagIndexCaretPosition(currentPosition.Lyric, new TextIndex(int.MaxValue, TextIndex.IndexState.End))));
}
return(new TimeTagIndexCaretPosition(currentPosition.Lyric, previousIndex));
}
public override TimeTagIndexCaretPosition MoveRight(TimeTagIndexCaretPosition currentPosition)
{
// get next caret and make a check is need to change line.
var lyric = currentPosition.Lyric;
var nextIndex = GetNextIndex(currentPosition.Index);
if (TextIndexUtils.OutOfRange(nextIndex, lyric?.Text))
{
return(MoveDown(new TimeTagIndexCaretPosition(currentPosition.Lyric, new TextIndex(int.MinValue))));
}
return(new TimeTagIndexCaretPosition(currentPosition.Lyric, nextIndex));
}
public override bool PositionMovable(TimeTagIndexCaretPosition position)
{
if (position.Lyric == null)
{
return(false);
}
if (TextIndexUtils.OutOfRange(position.Index, position.Lyric.Text))
{
return(false);
}
return(true);
}
public void TestOutOfRange(int index, TextIndex.IndexState state, string lyric, bool outOfRange)
{
var textIndex = new TextIndex(index, state);
Assert.AreEqual(TextIndexUtils.OutOfRange(textIndex, lyric), outOfRange);
}